Hazel Chu’s decision to run for the Seanad seemed to expose fault lines in the Green Party. Eamon Ryan wanted the party to support the Fianna Fail or Fine Gael candidates but Catherine Martin signed her nomination papers and, for those who were paying attention, it seemed to be another baffling tussle within the party. Hazel Chu represents the diversity some say the party desperately needs but others wonder if this is a solo run from a politician like any other. And what does it say about the Greens that a party which is supposed to be engaged on a…